ci: update test result action to use files instead of trx_files

[NelsonBN]

Checklist before requesting a review

• I have performed a self-review of my code.
• Implemented tests for new features.
• I tested the features already implemented.
• Added usage examples in the readme.

[github-actions]

Package	Line Rate	Branch Rate	Complexity	Health
PowerUtils.Geolocation	100%	100%	131	✔
Summary	100% (181 / 181)	100% (70 / 70)	131	✔

[Copilot]

Pull request overview

This PR updates the test workflow to use the standard files parameter instead of the workaround trx_files parameter for the publish-unit-test-result-action, removing the need for a previously documented workaround.

• Changed the EnricoMi/publish-unit-test-result-action configuration from trx_files to files parameter
• Removed the comment referencing GitHub issue #424 that explained the previous workaround

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[github-actions]

🚀 Stryker report generated 🚀

To more details: https://dashboard.stryker-mutator.io/reports/github.com/TechNobre/PowerUtils.Geolocation/update-cicd-publish-unit-test-result-action-183

[github-actions]

Test Summary

    4 files      4 suites   1s ⏱️
  252 tests   252 ✅ 0 💤 0 ❌
1 008 runs  1 008 ✅ 0 💤 0 ❌

Results for commit 6fe2852.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud